Telephone diaphragm



' M. D. DOMINGUEZ TELEPHONE DIAPHRAGM Fiied March 19, 1924 May 4 1926.

' not subject to" the distortion efieetsi of fthef ordinar metal or magnetic. diaphragrn,'- and;

Patented May 4, 1926 UNITED STATES PATE T oFFieE.

MANUEL n. 'DOMINGUEZ, or NEW ORLEANS, LOUISIANA, AssIeNon or bNE-HALF me P enAnLnsf A. DENIS A'Nn oNn-H Lrro enonen sARrY, BOTH or Nnw on nANs,

LOUISIANA.

' TELEPHONE DIAPHRAGM.

A pncanonaied March 1 9,, 1924. Serial No. 700,247.

To all whom it may concern: A

Be it known that I, MANUEL D. DoMIN- f GUEZ, a citizen of Spain, and resident of New Orleans, inthe .parish of Orleans and State of Louisiana, have invented certain new and."

useful Improvements in Telephone. Dia-f phragms, of which the following is' a specie fication.

. My invention relates to acoustic phragmsof types especially adapted tor use in telephone receivers.

. An important object of theinventi-ongisto. avoid obJecitons to operative character stics of magnetic or metalhc diaphragmaun'cluding sound distortion and 'otherdefects "ine ident to the use of suchdiaphragmsrlfisf well understood by persons skilled in the art.

I substitute for the ordinary diaphragm .l'

of magneticmetal a non-magnetieiandflpref erably a non-metallic diaphragm which" is.

is eapa 1c of reproducing, various-sounds,

including articulate speech, with practically phragm, usually at the center thereof, to move the diaphragm byrvariations in the d sc has no acoustle propertles, but serves magnetic flux of the receiver magnets.

invention are further sufiieiently explained in connection with the following detaildescription of the accompanying drawing,"

which shows various structures embodying the invention. After considering these examples skilled persons will understand that many variations may be madeflwithin theprinci les of the invention, and I contemf plate t 1e employment of any structures that receiver, with a diaphragm constructed in, aceordance with my invention lncorporated therein.

Fig. 2 is a front elevation of the same with cap or cover removed. a

'ter-ial, such as mica, celluloid, stifl' paperilom wood, ivory, or other material.

The characteristics and advantages ofthe' cap or cover 31, which is arranged toclam .the diaphragm against the wall of the case, I 'asusual.

The diaphragm 2 is of any suitable nonmagnetic, and preferably non-metallic maganicmembrane, hard carbon or, grep its, hard rubber, thin glass, certain kin s of j Fig. 3 shows a modified form "of die-J phragm in elevation and section.-

Figs 1, 5 and 6, show in a similar .way :-j0ther modified diaphragm structures.

In Figs. 1 and 2, 1 is any suitable case or housing for a telephone receiver, including the electromagnets 30, and provided with v[the ordinary centrally-apertured removable.

-.The diaphragm'is clamped about its margin in the usual wayand acts-merely as an acoustic element to impart ,vibrationst'o the air'by' its oscillation, and it doe s not'aet as usual as an electro-magnetie element, and is therefore free from the disadvantageous roperties 0t such-materials. To impart;vi--

rations to the diaphragm by reason of variations in the magnetic field, a suitable magnetic element such as the disc 4 is provided, "wluchis connected to thediaphragm at the center, by' means of a screw 3, nut 6 and spacing washers 5. The'magnets and the v main diaphragm are so locat'edthat the magnetic disc 4, which is usually of soft iron, is spaced properly away from the ma net poles. In this arrangement the magnetic merely as an operating member for the diaphragm, and it may thereforebe referred to;

m some cases as an armature o erated by the magnets'and connected to the iaphragm.

In Fig. 3 the diaphragm -8 may consist specifically of mica, and the operating elements or armatures 8 and 9 are thin discs of soft iron, usually mush smaller than-the diaphragm and secured to it by a suitable adhesive.

- In Fig. 4 the thin iron operating element or armature 10 is secured directly to. the diaphragm 11 by a screw 12 and nut 14, with or without an interposed washer 13.

In Fig. 5 the diaphragm 15 of non-magwhich confine iron filings may be of nonmagnetic material such as mica or other suitable material similar to that of the diaphragm, and secured adhesively. In this case the iron filings act as the magneticelement or armature.

Fig. 6 shows that the operating element or armature disc may be of other than circular shape. Specifically, in this instance, it is square, and'is glued or otherwise secured to the diaphragm 20, which may be of any of thematerials above stated or other siriiilar or equivalentmaterials.

When necessary or desirable, a rubber packing ring may be interposed between the mica diaphragm and receiver case 1 or between the diaphragm and the cap 31, or both. This arrangement has been employed in connection with metallic diaphragms and is therefore not particularly illustrated.

I claim A diagram structure for telephones and like uses, comprising a non-magnetic diaphragm, plates secured at opposite faces of the diaphragm in spaced relation, and comminuted magnetic metal substantially filling the chamber provided by the plates.

Signedat New Orleans, in the parish of Orleans and State of Louisiana this 28th day of February A. D. 1924.

MANUEL D. DOMINGUEZ. 

